SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    65005, 65037, 64920, 65122, 65064, 65069, 
    65496, 65527, 65525, 65530, 65443, 
    65429
  )

Query time 0.00094

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 12,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (65005,65037,64920,65122,65064,65069,65496,65527,65525,65530,65443,65429)"
    }
  }
}

Result